Building conversions offer particular challenges as the building (or part of a building) is being converted into something it wasn’t designed to be. For instance, loft conversions can be hampered by insufficient headroom often caused by the roof being too low and shallow pitched or; because the roof has to be insulated which in itself can take up some considerable space. The loft floor may need to be made stronger requiring deeper joists and therefore less headroom to the storeys above and below.


Barn conversions can present similar problems such as when walls are insulated resulting in reduced internal space. Local planning policy requirements will often insist that few if any new window or door openings are made so as to preserve as much as possible the appearance of the original barn.

These and many other considerations are part of the architect’s role in trying to achieve the best out of a building’s design. Below are a selection of conversion projects Pentargon Architecture has been engaged in.

CONVERSION AND EXTENSION OF TWO BARNS TO DWELLINGS, CLUBWORTHY, LAUNCESTON. Whilst retaining the essential characteristics of the orginal barns, planning permission was achieved for their conversion and extension (1813)

Egloskerry, North Cornwall The barn before conversion works

BARN CONVERSION AND EXTENSION, Egloskerry, Launceston. Two-storey barn to be converted and extended to create a new single family dwelling (1708)

EXTENSION TO FORMER BARN CONVERSION, NR LAUNCESTON. The converted barn received planning permission to effectively double the size of the dwelling (1407)

LOFT CONVERSION AND ALTERATION, LAUNCESTON. Two storey 1950’s house, Launceston. Conversion of the loft space into a master bedroom with ensuite and WC, with alterations to the ground floor kitchen and dining room and the creation of a garden patio (1112).

GARAGE WORKSHOP CONVERSION, CAMELFORD. The conversion of a former taxi business workshop into a single bedroom apartment (1004).


SHOP CONVERSION, CAMELFORD. Conversion of shop premises into a one bed apartment (1005).


LOFT CONVERSION, EXTENSION AND ALTERATION, SOUTH PETHERWIN 19c house, The work involved the conversion of a cob built integral garage with loft space above, into a master bedroom with ensuite and music room below; a new bathroom and a re-modelled utility room (1108)

BARN CONVERSION AND EXTENSION, near Stratton, Bude. Conversion of an agricultural building once used as a shippon and milking parlour with planning approval for a pair of attached 2-bed dwellings (1408)

Elevation: the original shippon has been extended to the rear to provide additional accommodation

BARN CONVERSION. GII LISTED BUILDING, NR LAUNCESTON. Proposed conversion of dilapidated stone barn to create two storey annexe with living accommodation ancillary to adjacent listed farm house (1120).

LOFT CONVERSION AND ALTERATION. Single storey dwelling, Halstead, Kent. Conversion of roof space to create 3 bedrooms – one with ensuite, with re-modelling of accommodation on the ground floor (1303).

GARAGE CONVERSION. Downe, Kent. Proposed garage conversion to create an additional bedroom with wet room (1308).

BARN CONVERSION AND EXTENSION (GII Listed), Trewen, Launceston. Single-storey barn to be converted into an annexe for the farmhouse (1605)

Barn conversion The original barn to be converted and extended

BARN CONVERSION AND EXTENSION (GII Listed), Trewen, Launceston. Single-storey barn to be converted into an annexe for the farmhouse (1605)

Long section drawing through the converted barn